1、AMSC N/A FSC 5920 INCH-POUND MIL-PRF-23419H 7 February 2013 SUPERSEDING MIL-PRF-23419G 24 June 2005 PERFORMANCE SPECIFICATION FUSE, CARTRIDGE, INSTRUMENT TYPE, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1
2、Scope. This specification covers the general requirements and test procedures for instrument type fuses designed for the protection of electrical, electronic, and communication equipment on direct current (dc) and alternating current (ac) (up to 400 hertz (Hz) circuits. 1.2 Classification. 1.2.1 Par
3、t or Identifying number (PIN). The PIN designation is in the following form and as specified (see 3.1 and 6.2). FM08 A 125 V 1/2 A * Style Characteristic Voltage rating Current rating Optional finish (1.2.1.1) (1.2.1.2) (1.2.1.3) (1.2.1.4) (1.2.1.5) 1.2.1.1 Style. The style is identified by the lett
4、ers “FM“ followed by a two-digit number denoting a fuse of a given construction and dimensions. 1.2.1.2 Characteristic. The characteristic is identified by a one-letter symbol which indicates the relative overload interrupt time (see 6.5) in accordance with table I. TABLE I. Characteristics. Symbol
5、Relative overload interrupt time A Normal B Time delay Comments, suggestions, or questions on this document should be addressed to: DLA Land and Maritime, ATTN: DLA Land and Maritime-VAT, Post Office Box 3990, Columbus, Ohio 43218-3990 or emailed to mailto:CircuitProtectdla.mil. Since contact inform
6、ation can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419H 2 1.2.1.3 Voltage rating. The voltage rating i
7、s the maximum dc or ac root mean square (rms) voltage for which a fuse is designed (see 3.1). The voltage rating is identified by a numerical value followed by the letter “V“. (See paragraph 6.1.3 concerning use of FM08 style fuses in vacuum applications.) 1.2.1.4 Current rating. The current rating
8、is the amount of current a fuse will carry indefinitely without interruption (see 3.1). The current rating in amperes and fractions of an ampere is identified by a numerical value followed by the letter “A“. 1.2.1.5 Optional finish. When specified, a suffix letter is added to the type designation co
9、vered by selected specification sheets to denote optional finish (see 3.1). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or reco
10、mmended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 G
11、overnment documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2)
12、. DEPARTMENT OF DEFENSE SPECIFICATIONS (See supplement 1 for list of associated specification sheets.) DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. MIL-STD-790 - Standard Practice for Established Reliability and High Reliability Qualified
13、Products List (QPL) Systems for Electrical, Electronic, and Fiber Optic Parts Specifications. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at https:/assist.dla.mil/quicksearch/ or https:/assist.dla.mil or from DLA Document Services, 700 R
14、obbins Avenue, Building 4/D, Philadelphia, PA 19111-5094). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419H 3 2.2.2 Other Government documents, drawings and publications. The following other Government documents, drawings, and publicati
15、ons form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA) NASA Reference Publication 1124 - Outgassing Data for Selected Spacecraft M
16、aterials. (Hard copies of this document are no longer available from the NASA Goddard Materials Branch or the DLA Document Services Office. This information is only available at http:/outgassing.nasa.gov/ 2.3 Non-Government publications. The following documents form a part of this document to the ex
17、tent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM E595 - Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgass
18、ing in a Vacuum Environment. (Copies of this document are available online at http:/www.astm.org or from the American Society for Testing Materials, 100 Barr Harbor Drive, PO Box C700, West Conshohocken. PA 19428-2959). TECHAMERICA EIA-557 - Statistical Process Control Systems. (Copies of this docum
19、ent are available online at http:/www.techamerica.org or from TechAmerica, 601 Pennsylvania Avenue, NW, North Building, Ste. 600, Washington, DC, 20004-2601). UNDERWRITERS LABORATORIES, INC. (UL) UL 248-1 - Standard for Low-Voltage Fuses, Part 1: General Requirements. (Copies of this document are av
20、ailable online at http:/ or from the Underwriters Laboratories Incorporated, 2600 N. W. Lake Road, Camas, WA 98607-8542). 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of conflict between the test of this document and the references cited herein (expect for
21、related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
22、L-PRF-23419H 4 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheets. In the event of any conflict between requirements of this specification and the specification sheet, the latter shall gov
23、ern. 3.1.1 Fuses with ratings not covered by a specification sheet. The requirements of this specification shall apply to fuses with other voltage and current ratings, provided the fuse has the same dimensions and falls within the minimum and maximum current and voltage rating of an existing specifi
24、cation sheet, and conforms to all other requirements of that specification sheet. The Qualified Products List (QPL) shall be applicable to these fuses 3.2 Qualification. Fuses furnished under this specification shall be products that are authorized by the qualifying activity for listing on the appli
25、cable qualified products list before award of contract (see 4.4 and 6.3). 3.3 QPL system. The manufacturer shall establish and maintain a QPL system for fuses covered by this specification. Requirements for this system are specified in MIL-STD-790 with details as specified in 4.2. 3.3.1 Statistical
26、Process Control (SPC) system. As part of the overall MIL-STD-790 QPL system, the manufacturer shall establish a SPC system that meets the requirements of EIA-557. 3.4. Material. The material for each part shall be as specified herein. When a definite material is not specified, a material shall be us
27、ed which will enable the fuses to meet the performance requirements of this specification. Note, however, that the tin content of fuse components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 3.5.5). Acceptance or approval of any
28、 constituent material shall not be construed as a guaranty of the acceptance of the finished product. 3.5 Interface and physical dimensions. Fuses shall be of the interface and physical dimensions as specified (see 3.1). 3.5.1 Mounting. Fuses parameters shall allow for convenient insertion and remov
29、al from printed wiring boards, fuseclips, or holders as specified (see 3.1). 3.5.2 Terminal mounting. Terminals shall be secured to the fuse body so that they shall not loosen. The fuse wire shall be so attached to the terminals that there shall be no danger of breaking the fuse wire or connections
30、when installing the fuse. Terminals other than the ends to which the fusible elements are attached shall be free from solder. 3.5.3 Ferrule alignment. Fuses with ferrule terminals shall pass through a tubular gauge having a length equal to that of the fuse. The tubular gauge shall have an internal d
31、iameter of .005 inch (0.13 mm) greater than the maximum ferrule diameter for fuse lengths up to and including 1.750 inches (44.45 mm). For fuse lengths greater than 1.750 inches (44.45 mm), the tubular gauge shall have an internal diameter .010 inch (0.25 mm) greater than the maximum ferrule diamete
32、r. 3.5.4 Indication. When specified (see 3.1), the fuse shall be such that it is possible to determine that the fuse is open, without removing the fuse from the circuit. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419H 5 3.5.5 Terminal
33、finish or plating. Ferrules or other terminals shall be finished (plated, dipped, coated) or shall be natural (no finishing process), as specified (see 3.1). When silver plating is specified (see 1.2.1.5), the letter “S“ shall be added as a suffix to the type designation. Finish shall be optional wh
34、en not specifically designated and shall enable the fuses to meet the performance requirements of this specification. However, the use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content shall not exceed 97 percent, by mass. Tin shall be alloyed w
35、ith a minimum of 3 percent lead, by mass (see 6.7). 3.6 Continuity. Fuses shall have electrical continuity (see 4.7.2). 3.7 Resistance (when applicable (see 3.1). Fuses shall have electrical resistance as specified (see 3.1 and 4.7.3). 3.7.1 Voltage drop (when applicable (see 3.1). Fuses shall have
36、the voltage drop as specified (see 3.1 and 4.7.3.1). 3.8 Current-carrying capacity. Fuses shall show no evidence of mechanical damage and shall carry current as specified (see 3.1) without electrical failure. Unless otherwise specified, the temperature of the case, body, or terminals shall not rise
37、more than 70C above room ambient temperature (see 3.1 and 4.7.4). 3.9 Terminal strength. Fuse terminals shall not become damaged when subjected to the specified force (see 3.1 and 4.7.5). 3.10 Overcurrent. 3.10.1 Overload interrupt. Fuses shall open the circuit within the time limits specified (see
38、3.1) without causing the case or body to char or fracture. The circuit shall remain open without the circuit closing again during the one-minute period after interrupt. There shall be no mechanical failure (see 4.7.6.1). 3.10.2 Maximum current clearing I2t (when specified, (see 3.1). When fuses are
39、tested as specified in 4.7.6.2, the amount of ampere-squared seconds passed by the fuse during melting, arcing, or clearing time shall not exceed the value specified (see 3.1). 3.10.3 Short circuit interrupt. Fuses shall remain intact and shall open the circuit. The fuse shall remain in the energize
40、d circuit for 30 seconds minimum without any indication of the circuit closing again. The insulation shall not puncture, the terminals or body shall not rupture or separate, and the terminals shall not be shunted (see 4.7.6.3). 3.11 Outgassing (when specified, (see 3.1). When the fuses or the fuse m
41、aterials are tested as specified in 4.7.7, the materials shall meet the following requirements: Total mass loss (TML) - Shall not exceed 1.0 percent. Collected volatile condensable material (CVCM) - Shall not exceed 0.1 percent. Materials data listed in the latest revision of the NASA Reference Publ
42、ication 1124 which meet these TML and CVCM requirements may be substituted in lieu of testing. 3.12 Vibration. 3.12.1 Vibration, high frequency. When tested as specified in 4.7.8.1, there shall be no electrical or mechanical damage to the fuse. Provided by IHSNot for ResaleNo reproduction or network
43、ing permitted without license from IHS-,-,-MIL-PRF-23419H 6 3.12.2 Vibration, random (when specified, (see 3.1). When tested as specified in 4.7.8.2, there shall be no electrical or mechanical damage to the fuse. 3.13 Shock. When tested as specified in 4.7.9, there shall be no electrical or mechanic
44、al damage to the fuse. 3.14 Salt atmosphere (corrosion). When tested as specified 4.7.10, there shall be no evidence of excessive corrosion. Excessive corrosion is defined as that which interferes with the electrical or mechanical performance, or in the case of plated metals, corrosion which has pas
45、sed through the plating and attacked the base metal. There shall be no warping, cracking, or other electrical or mechanical damage to the fuse. 3.15 Moisture resistance. When tested as specified in 4.7.11, there shall be no cracking, peeling, loosening of terminals or evidence of electrolytic corros
46、ion. When labels are used there shall be no evidence of peeling, wrinkling, ends lifting or illegible ink markings. 3.16 Thermal shock. When tested as specified in 4.7.12, the fuses shall show no mechanical or electrical damage and there shall be no loosening of the terminals or other parts. 3.17 So
47、lderability (when specified, (see 3.1). When fuses are tested as specified in 4.7.13, the dipped portion of the leads shall conform to the solid-wire termination criteria in accordance with method 208 of MIL-STD-202. 3.18 Resistance to soldering heat (when specified, (see 3.1). When tested as specif
48、ied in 4.7.14, the fuses shall show no evidence of external damage. 3.19 Marking. Unless otherwise specified (see 3.1), each fuse shall be marked in accordance with method I of MIL-STD-1285. 3.19.1 Ferrule and end cap marking. When fuse ferrules and end caps are marked, the marking shall include the
49、 following: a. Type designation (see 1.2.1). b. Manufacturers name, trademark, or code symbol. 3.20 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or excee
